After a teenager used her boyfriend's testicles in lieu of a beauty-blending sponge a few weeks ago, you would have thought the Internet had seen the last of the crazy, just-for-shock-value fads.

Apparently, the beauty world isn't there yet, though.

Just this week, more viral cosmetic trends thought to have jumped the shark so much they were dead on arrival have had a resurgence.

From contouring with a fidget spinner to applying 100 layers of sheet masks in a single sitting, see which Instagram sensations have come back to life.

FAD THAT WON'T DIE: THE 100 LAYERS CHALLENGE

When Jenna Mourey a.k.a. Jenna Marbles posted her parody video of the Ultimate 100 Coats of Things back in December, we thought we'd seen the last of the absurd 100-layer challenge, which saw vloggers applying 100 coats of everything from nail polish to foundation in the hopes of gaining viewers.

'I saw you beauty community, and I raised you five other coats of things,' she says in the video after applying 100 layers of liquid lipstick, foundation, glitter nail polish, self tanner, hairspray and false lashes.

We should've known, however, that no matter how ridiculous the premise and how long it took her to achieve (7.5 hours if you're wondering), it would pay off in the end. The video earned Jenna over 11 million views.

'I used a marshmallow to blend my makeup and I kid you not it actually blended well!' she wrote. 'I was so shocked (my marshmallows were kept in the refrigerator hence they were hard enough to blend my makeup effortlessly).'

After facing backlash from her commenters about wasting food, she added, 'EDIT: YOU GUYS REALLY NEED TO CHILL. STOP TAKING EVERYTHING SO SERIOUSLY. NO ONE USES THIS ON A DAILY BASIS. THIS WAS JUST FOR FUN. LITERALLY USING A SINGLE MARSHMALLOW DOESN'T CAUSE WORLD HUNGER OR FAMINE. MARSHMALLOW ISN'T EVEN A REAL FOOD FFS.

'Yes I did use a marshmallow. No I'm not wasting food, I know my etiquettes well. Makeup has no rules and we can go out of the way and try new things. Do not come at me with your negativity. Keep your negativity to yourself.'

A post shared by James Charles (@jamescharles) on May 19, 2017 at 4:21pm PDT

And now YouTube star and CoverGirl spokesperson James Charles has garnered attention for using a fidget spinner to apply his contour and highlight.

'FIDGET SPINNER CONTOURING?! Have you guys played with one of these things yet?!,' he asked his 1.9M Instagram followers of the popular toy. 'I thought they were so dumb at first but they really help with ADHD and they're so fun.'

FAD THAT WON'T DIE: MERMAID MAKE-UP

A woman has turned herself into a mermaid using special effect products and popular makeup brands - and her effort has gone viral with hundreds of thousands of people sharing it

Channing Carlisle posted the picture to Twitter and it has since gone viral with over 51,000 shares

The self-taught makeup artist uses special effects products and popular makeup brands to achieve her incredible looks

Once the Internet seemed to collectively move on from mermaids to unicorns, we thought the days of scaly-looking skin, courtesy of talented make-up artists, would be left to Halloween and costume parties.

But ever since 23-year-old Channing Carlisle posted a very realistic image of her leg covered in shiny fish scales last week, commenters haven't been able to stop talking about it. It's been shared more than 51,000 times and liked by more than 195,000 people.

While some critics say it looks like the leg is rotting, the overwhelming majority find it mesmerizing.

The self-taught make-up artist used special-effects products to help her achieve the look, so we doubt we'll see too many knock-offs anytime soon, but the image could easily reignite people's inner Ariel and see them painting colorful scales on their faces once again.

Under the sea: In January 2016, make-up artists took to Instagram to show off their Ariel-inspired looks using the #mermaidmakeup

FAD THAT WON'T DIE: UNICORN EVERYTHING

Unicorns go high fashion: During the Romance Was Born runway show during Australia Fashion Week, a model wore a horn headpiece down the catwalk

Do you believe in magic? Brands like Tarte Cosmetics (left) and Wet n Wild (right) have launched products specifically for the unicorn-obsessed

The unicorn trend has been going strong for well over a year now, and it shows approximately zero signs of coming to an end any time soon.

High-end make-up brands like Tarte Cosmetics have been capitalizing on the magic with on-theme products for months now.

And just this week drugstore favorite Wet n Wild launched its $30 Unicorn Glow Summer Limited Edition Collection. Inside the box, adorned with a holographic unicorn, of course, buyers will find a nine-piece set that includes rainbow highlighters, a unicorn horn-shaped brush and prismatic lip colors.

Even the fashion set hasn't been able to ignore the mythical creature. One of the models at the Romance Was Born show walked the runway wearing a unicorn horn headpiece during this past Australia Fashion Week.